“While tunnels are probably the most obvious obstacle to achieving line of sight, mobile signals are also blocked by mountains, trees, buildings, etc.,” says Val. Even the train itself can block mobile signals, because they are essentially big metal tubes traveling at incredibly high speeds.
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A low-voltage electric current is sent between the two rails via a series of relays like the ones in this photo. When a train approaches, the current runs through the train's metal wheels and axles instead of the relays. This short circuit activates the crossing signal.
Usually the signals are manually controlled from a remote office. Outside CTC limits, a sophisticated ABS system that can detect train direction also will use them to protect movement between sidings. Such a system is termed an Absolute Permissive Block System.
Trains absolutely interfere with wifi. How can I make strong connection if my computer too far from the router? When connecting to the Internet why is it difficult to connect to the IP address?
With the advent of 5G, cellular technology has evolved to a point where truly digitalised rolling stock becomes possible. Up to 100x faster than its 4G predecessor, 5G will be critical to the success of real-time operations on-board trains. But, how does train-to-ground communication actually work?